Since 2007, when the alerts started, there have been 789 activations -- 740 times, the person was found during the alert. That's a 94% success rate.

However, the State does not track how frequently the same person goes missing. When Robert Milburn - from Rosenberg -- recently disappeared, a spokesperson for the Fort Bend County Sheriff’s Department said that was Milburn’s third Silver Alert.

When an alert is cancelled, a TxDOT spokesperson says they are generally not asked to announce that on the electronic boards. So most people never know the search is over or how it ended.

Thirty-five states have a Silver Alert, or something like it. But according to the American Silver Alert Coalition, no one publishes national success rates.